EP0766016B1 - Perfected sealing and guard ring for rolling bearings - Google Patents

Perfected sealing and guard ring for rolling bearings Download PDF

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Publication number
EP0766016B1
EP0766016B1 EP96115305A EP96115305A EP0766016B1 EP 0766016 B1 EP0766016 B1 EP 0766016B1 EP 96115305 A EP96115305 A EP 96115305A EP 96115305 A EP96115305 A EP 96115305A EP 0766016 B1 EP0766016 B1 EP 0766016B1
Authority
EP
European Patent Office
Prior art keywords
radial projection
ring
bearing
armature
roller elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96115305A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0766016A3 (en
EP0766016A2 (en
Inventor
Alberto Visconti
Giovanni Giromella
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RFT SpA
Original Assignee
RFT SpA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by RFT SpA filed Critical RFT SpA
Publication of EP0766016A2 publication Critical patent/EP0766016A2/en
Publication of EP0766016A3 publication Critical patent/EP0766016A3/en
Application granted granted Critical
Publication of EP0766016B1 publication Critical patent/EP0766016B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7859—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element
    • F16C33/7863—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element mounted to the inner race, e.g. a flinger to use centrifugal effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
    • F16C19/24—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly
    • F16C19/26—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings for radial load mainly with a single row of rollers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/784—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race
    • F16C33/7859—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element
    • F16C33/7866—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to a groove in the inner surface of the outer race and extending toward the inner race with a further sealing element with sealing lips

Definitions

  • the present invention relates to a sealing and guard ring for rolling bearings, particularly heavy duty bearings of farm and/or earth-moving equipment, subjected regularly to external pollutants such as abrasive dust, soil and/or vegetable particles, muddy water, etc.
  • a sealed rolling bearing according to the preamble of claim 1 is known by EP-A-337 321.
  • One particular type of ring for sealing and protecting rolling bearings from external pollutants comprises a radial annular armature made of metal and presenting a cylindrical peripheral bead, which is forced on to the normally stationary outer ring of the bearing; and an elastomeric membrane is co-molded on to the armature, and terminates with a circular inner edge in the form of a sealing lip, which is fitted with a small amount of interference inside a cylindrical seat to act as a sliding seal on the rotary inner ring of the bearing.
  • seals of the above type are unsuitable for applications involving severe pollution, such as farm and/or earth-moving equipment subjected to abrasive dust, soil or muddy water.
  • Numbers 1, 2 and 3 in the accompanying drawing respectively indicate an outer ring, an intermediate rolling element, e.g. a cylindrical roller, and an inner ring of a rolling bearing 4, which must be adequately protected against external pollutants, and sufficiently sealed to retain the lubricant inserted during manufacture.
  • Rollers 2 are maintained equally spaced by a retainer 6; and, in the following description, it is assumed, without limiting the scope of the present invention, that outer ring 1 is stationary and inner ring 3 rotary.
  • the sealing ring 7 comprises an annular metal armature 8 in turn comprising a flat radial portion 9 interposed between two bent end portions 10 and 12 for increasing the rigidity of armature 8.
  • An elastomeric rubber element 14 is cured by co-molding on to armature 8, predominantly on to the surface of armature 8 facing inwards of the bearing, i.e. facing rollers 2.
  • Rubber element 14 is annular, and comprises, at the outer edge, a thick annular rib 16, which is forced elastically inside an annular groove 17 formed close to the edge 18 of outer ring 1 of bearing 4 and open on the side facing inner ring 3, so that sealing ring 7 is secured by friction to stationary outer ring 1.
  • rib 16 presents a radial projection 20 cooperating with a corresponding radial projection 22 on edge 18 to form an annular labyrinth conduit 23 and provide for improved sealing between ring 7 and outer ring 1 of bearing 4.
  • armature 8 is bent roughly 180° outwards of bearing 4 to form an axial bead 24.
  • sealing ring 7 On the smaller-radius side facing inner ring 3 of bearing 4, sealing ring 7 comprises a circular sealing lip 25 bent elastically away from rollers 2 and interference-fitted to a cylindrical surface 26 of inner ring 3; and lip 25 is associated with an inner radial projection 27 separated by a small radial clearance from surface 26 of inner ring 3 to form a labyrinth seal next 10 conduit 28, the dynamic effect of the air in which provides for improved sealing by lip 25 as inner ring 3 rotates.
  • a further projection 29, connected continuously to and radially opposite projection 27, is located, with little and approximately no interference, adjacent to an annular centrifugal element 30 force-fitted integral with inner ring 3 of bearing 4 and on the opposite side of sealing ring 7 to rollers 2.
  • Centrifugal element 30 comprises a metal ring lying substantially in a radial plane and in turn comprising a cylindrical portion 31 fitted to surface 26 of inner ring 3 and connected in one piece to a portion 32, which cooperates with further projection 29, slopes towards rollers 2, and terminates with a portion 33 sloping the opposite way, outwards of bearing 4.
  • Further projection 29 performs two functions: firstly, it prevents the entry of large particles of pollutant substances when bearing 4 is stationary; and, secondly, by virtue of the centrifugal action of element 30, it provides for expelling any small particles (dust) or liquid from the region adjacent to labyrinth 28 as inner ring 3 rotates.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sealing Of Bearings (AREA)
  • Sealing With Elastic Sealing Lips (AREA)
  • Rolling Contact Bearings (AREA)
EP96115305A 1995-09-26 1996-09-24 Perfected sealing and guard ring for rolling bearings Expired - Lifetime EP0766016B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT95TO000768A IT1281364B1 (it) 1995-09-26 1995-09-26 Anello di tenuta e protezione perfezionato per un cuscinetto a rotolamento.
ITTO950768 1995-09-26

Publications (3)

Publication Number Publication Date
EP0766016A2 EP0766016A2 (en) 1997-04-02
EP0766016A3 EP0766016A3 (en) 1997-09-17
EP0766016B1 true EP0766016B1 (en) 2002-05-15

Family

ID=11413835

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96115305A Expired - Lifetime EP0766016B1 (en) 1995-09-26 1996-09-24 Perfected sealing and guard ring for rolling bearings

Country Status (4)

Country Link
EP (1) EP0766016B1 (it)
DE (1) DE69621202T2 (it)
ES (1) ES2174009T3 (it)
IT (1) IT1281364B1 (it)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2378735B (en) * 2001-08-15 2003-06-25 Nsk Europ Technology Co Ltd Seals for rolling element bearings
GB2388409B (en) * 2002-05-10 2005-08-31 Polymer Sealing Solutions Ltd Seal
DE102009006955A1 (de) 2009-01-31 2010-08-05 Schaeffler Technologies Gmbh & Co. Kg Dichtungselement für ein Lager
WO2011160657A1 (en) * 2010-06-25 2011-12-29 Aktiebolaget Skf Lip seal
DE102017100455A1 (de) * 2017-01-11 2018-07-12 Parker Hannifin Manufacturing Germany GmbH & Co. KG Dichtungsanordnung
CN110886782A (zh) * 2019-12-26 2020-03-17 瓦房店轴承集团国家轴承工程技术研究中心有限公司 密封防尘组合式轴承密封结构

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2723869A (en) * 1952-01-26 1955-11-15 Gen Motors Corp Demountable closure
US2945707A (en) * 1956-10-15 1960-07-19 Wasley Products Inc Bearing seal
US4106781A (en) * 1977-04-28 1978-08-15 Garlock Inc. Unitized, grease-purgeable seal
IT8153143U1 (it) * 1981-04-15 1982-10-15 Riv Skf Officine Di Villar Perosa S P A Complesso di tenuta comprendente due labbri, uno assiale e l'altro radiale ed un labirinto
DE3320063A1 (de) * 1983-06-03 1984-12-06 Skf Kugellagerfabriken Gmbh, 8720 Schweinfurt Dichtring fuer radialwaelzlager
IT8553275U1 (it) * 1985-04-19 1986-10-19 Riv Skf Officine Di Villar Perosa S P A Complesso di tenuta in due elementi, di tipo perfezionato
IT1206866B (it) * 1987-01-28 1989-05-11 Riv Officine Di Villar Perosa Cuscinetto stagno per condizioni dilavoro eccezionalmente gravose
IT1219200B (it) * 1988-04-12 1990-05-03 Riv Officine Di Villar Perosa Complesso di tenuta perfezionato del tipo a doppio schermo e cuscinetto di rotolamento provvisto di tale complesso di tenuta
JPH022526U (it) * 1988-06-16 1990-01-09
US5292199A (en) * 1993-05-07 1994-03-08 Ford Motor Company Axle wheel seal and bearing arrangement for a motor vehicle

Also Published As

Publication number Publication date
DE69621202T2 (de) 2002-11-28
ITTO950768A1 (it) 1997-03-26
ES2174009T3 (es) 2002-11-01
DE69621202D1 (de) 2002-06-20
EP0766016A3 (en) 1997-09-17
ITTO950768A0 (it) 1995-09-26
EP0766016A2 (en) 1997-04-02
IT1281364B1 (it) 1998-02-18

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